Non-contact SQUID-NDT method using a ferrite core for carbon-fibre composites

Yoshimi Hatsukade*, Naoko Kasai, Hiroshi Takashima, Atsushi Ishiyama


研究成果: Article査読

15 被引用数 (Scopus)


Carbon-fibre composites (CFCs), such as carbon-fibre-reinforced plastic (CFRP), are promising composite materials for aerospace structures. However, there is no reliable non-contact NDT method for the detection of deep-lying cracks in thick CFCs at the present time. In this study a non-contact eddy-current-based SQUID-NDT method for thick CFCs was developed. Because CFC is conductively low (electrically), and the target CFC is thick, an induction coil with a U-shaped ferrite core was employed to generate a strong induction field while supplying a low frequency current to the coil. This method was applied to 20 mm thick CFRP specimens with hidden slots at various depths. All signal responses due to the slots located at 5 mm up to 17.5 mm in depth were successfully detected while supplying 150 mA at 300 Hz. The peak amplitude of the response obtained by the method was the same as, or larger than, that of previous results on the same specimens by the current injection method. It shows that the developed method can efficiently induce a large eddy current in the conductively low specimen. It is concluded that this method has the potential to be applicable to the non-contact NDT on very thick CFCs.

ジャーナルSuperconductor Science and Technology
出版ステータスPublished - 2002 12月 1

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学


「Non-contact SQUID-NDT method using a ferrite core for carbon-fibre composites」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。